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Polydesmia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Actinoceratoidea
Order:
Actinocerida
Family:
Polydesmiidae
Formal Genus Name and Reference:
Polydesmia LORENZ, 1906
Type Species:
P. canaliculata, M
Images
(Click to enlarge in a new window)
Fig. 140, 1a-c. *P. canaliculata, Manchuria, 1a, b, siphuncle, transv. and long. secs. (orientation unknown), x1.5 (109), 1c, part of segment, x4 ( s, septum, c, circulus, c r, connecting ring (broken line where destroyed), r c, radial canal (Teichert, n). -- Fig. 140, 1d. P. zuezshanensis Chang, Manchuria, transv. sec. of shell (outer line=shell, middle line = max. diam. of siphuncle, inner line = septal foramen), x1.3 (219).
Synonyms
Maruyamaceras, Murayamaceras, Maruyamacerina
Geographic Distribution
C. & E.Asia
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Characters of family, septal necks equaling about one-third to one-half length of camerae
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Actinoceratoidea
Order:
Actinocerida
Family:
Polydesmiidae
Formal Genus Name and Reference:
Polydesmia LORENZ, 1906
Type Species:
P. canaliculata, M
Images
(Click to enlarge in a new window)
Fig. 140, 1a-c. *P. canaliculata, Manchuria, 1a, b, siphuncle, transv. and long. secs. (orientation unknown), x1.5 (109), 1c, part of segment, x4 ( s, septum, c, circulus, c r, connecting ring (broken line where destroyed), r c, radial canal (Teichert, n). -- Fig. 140, 1d. P. zuezshanensis Chang, Manchuria, transv. sec. of shell (outer line=shell, middle line = max. diam. of siphuncle, inner line = septal foramen), x1.3 (219).
Synonyms
Maruyamaceras, Murayamaceras, Maruyamacerina
Geographic Distribution
C. & E.Asia
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Characters of family, septal necks equaling about one-third to one-half length of camerae